在民勤向日葵菌核病发生严重区进行了不同播期试验，结果表明，随着播期的推迟，向日葵菌核病的发生程度逐步降低，产量呈先增加后降低趋势。播期为5月20日时向日葵菌核病发病率较低，为6%；产量最高，为3 727.3 kg/hm2。说明调节播期可以减轻向日葵菌核病的发生危害，5月20日左右为最适播期。

Different sowing dates of sunflower in the region with the most serious Sclerotinia sclerotiorum in Minqin were tested. The results showed that with the delay of the sowing period， the incidence of sunflower Sclerotinia sclerotiorum was gradually reduced. On May 20， the incidence of Sclerotinia sclerotiorum in sunflower was the lowest， 6%， with the highest yield of 3 727.3 kg/hm2. It explained that the occurrence of and damage from sunflower Sclerotinia sclerotiorum could be reduced by the regulation of sowing time， and the best date was around May 20.

S565.5

国家特色油料产业技术体系建设项目(CARS-14-2-22)；甘肃省农业科学院科研条件建设及成果转化项目(2017GAAS22)；甘肃省特色产业技术体系项目。